According to various sources, including mostly opera: Riccardo Muti in Salzburg: Otello - Blogger, Maria Luigia Borsi performed at the Salzburg Festival in 2008, specifically in the opera "Otello" conducted by Riccardo Muti and directed by Stephen Langridge.
Here's a quote from the source:
"Maria Luigia Borsi with Riccardo Muti and Aleksandrs Antonenko. Otello. Grosses Festspielhaus. Salzburg Festival, August 21st 2008. Director: Stephen Langridge. Cast: Aleksandrs Antonenko (Otello), Maria Luigia Borsi (Desdemona), Carlos Àlvarez (Iago), Stephen Costello (Cassio). Conductor: Riccardo Muti with the Vienna Philharmonics."
Additionally, her official website Performances - Maria Luigia Borsi lists her performances, including the Salzburg Festival in 2008.
Here's a relevant image from Getty Images: https://media.gettyimages.com/id/613257124/fr/photo/with-the-israel-philharmonic-orchestra-italian-lyric-soprano-maria-luigia-borsi-performs-don.jpg?s=612x612&w=gi&k=20&c=5pX-cDxY3pRiQJ0FeUN21zoUsa26TxRwastztgR9NJ0=
Please let me know if you need more information!
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